Strange Architectural Homes & Buildings in Greece.

I found this rather out of the ordinary from the net. These are homes and buildings erected below the hills in Greece. I presume air-condition is not necessary on hot days as the cool rock may emit a cool temperature. Most likely the nights should be cold as well. Notice the people having drinks in one of the cafeteria in the photos below. This is cool.

Here is another few photos posted to me by a nice gentleman, Mr. CJ Cristos.
He says,"This house is in Ikaria island, in east Aegen sea. It must be over 500 years there. Most of the building i found in this vilage are built using the 'back' of big rocks."

Well, thanks CJ for the input of fresh knowledge.